SWRU423A July 2015 – May 2016 WL1801MOD , WL1805MOD , WL1807MOD , WL1831MOD , WL1835MOD , WL1837MOD
The mechanism uses the number of APs on a channel as a crude measure for the noise on that channel. If 40-MHz operation is required, the ACS algorithm tries to choose an appropriate secondary channel (above or below) by going over all of the channel pairs where the primary channel has a minimum number of APs. If such a pair is found that satisfies all constraints, 40-MHz operation is enabled. Otherwise, the AP is enabled with 20-MHz operation.
A further optimization has been added to choose the best 40-MHz secondary channel.
When choosing a channel, scan all available secondary channels to choose one with the minimum amount of APs.